Central bank may act in the trade on their own to influence the national currency, or together with other central banks to conduct a joint monetary policy in the world market or for associated interventions.

Central banks are properly entering the Forex not for profit, but to check our own steadiness or correct the existing national FX market rate for it has a significant conclusion on the home economic system.
Through Concerted intervention, nations associate to augment or lower specific valutas with the use of their individual currency funds. The practicability and success of this sort of intervention reckons on the amount of nations involved and the entire number of intervention (famous as the wideness and depth).